virtio_net: Fix misalignment bug in struct virtnet_info

{
  "id": "7bb3e938e7d4bcd9d9067f4697e5fcc6c72553224fe47a0ff4e6a589a2212129",
  "url": "https://osv.dev/vulnerability/CVE-2026-23143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "virtio_net: Fix misalignment bug in struct virtnet_info",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: virtio_net: Fix misalignment bug in struct virtnet_info Use the new TRAILING_OVERLAP() helper to fix a misalignment bug along with the following warning: drivers/net/virtio_net.c:429:46: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end] This helper creates a union between a flexible-array member (FAM) and a set of members that would otherwise follow it (in this case `u8 rss_hash_key_data[VIRTIO_NET_RSS_MAX_KEY_SIZE];`). This overlays the trailing members (rss_hash_key_data) onto the FAM (hash_key_data) while keeping the FAM and the start of MEMBERS aligned. The static_assert() ensures this alignment remains. Notice that due to tail padding in flexible `struct virtio_net_rss_config_trailer`, `rss_trailer.hash_key_data` (at offset 83 in struct virtnet_info) and `rss_hash_key_data` (at offset 84 in struct virtnet_info) are misaligned by one byte. See below: struct virtio_net_rss_config_trailer { __le16 max_tx_vq; /* 0 2 */ __u8 hash_key_length; /* 2 1 */ __u8 hash_key_data[]; /* 3 0 */ /* size: 4, cachelines: 1, members: 3 */ /* padding: 1 */ /* last cacheline: 4 bytes */ }; struct virtnet_info { ... struct virtio_net_rss_config_trailer rss_trailer; /* 80 4 */ /* XXX last struct has 1 byte of padding */ u8 rss_hash_key_data[40]; /* 84 40 */ ... /* size: 832, cachelines: 13, members: 48 */ /* sum members: 801, holes: 8, sum holes: 31 */ /",
    "evidence": "osv:CVE-2026-23143",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.114",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23143",
      "aliases": [
        "CVE-2026-23143"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "d1e9614a142eff34c93e94a15a71ad0e806799c4"
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            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "ed3100e90d0d120a045a551b85eb43cf2527e885"
                },
                {
                  "fixed": "ae48108c2310f1dd700e0dbb655c2f1d92ed00fc"
                },
                {
                  "fixed": "4156c3745f06bc197094b9ee97a9584e69ed00bf"
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            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "6.12.91"
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                  "fixed": "6.12.114"
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            "v6.12.110",
            "v6.12.109",
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            "v6.12.107",
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            "v6.12.103",
            "v6.12.102",
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            "v6.12.100",
            "v6.12.99",
            "v6.12.98",
            "v6.12.97",
            "v6.12.96",
            "v6.12.95",
            "v6.12.94",
            "v6.12.93",
            "v6.12.92",
            "v6.12.91"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23143.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "6.12.114"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.7"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23143.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.176274427Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4156c3745f06bc197094b9ee97a9584e69ed00bf",
        "https://git.kernel.org/stable/c/ae48108c2310f1dd700e0dbb655c2f1d92ed00fc",
        "https://git.kernel.org/stable/c/d1e9614a142eff34c93e94a15a71ad0e806799c4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23143.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23143",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 522265,
  "published_at": "2026-02-14T15:36:08.834+00:00"
}